Method of metal ornamentation.



No. 70,789. vhmm mv. J4, |902.

T. HUSERMANN.

METHOD` 0F METAL ORNAMENTATION.

` (Applicatiqn led Sept. 28, 1801.)

(No Model.)

Ziyi

PATENT QFFICE.

THEODOR HUS'ERMANN, OF VIENNA, AUSTRIA-HUNGARY METHoDoi-'METAL ORNAMENTATION.

SPECIFICATION forming part of Letters Patent No. 712,789, dated November 4, 17902. Application filed September `28, 1901. Serial No. 76,855. (No specimens.)

To ail whom it may concern:V

Beit known that I, THnoDoR HUSERMANN, asubject of the Emperorof Austria-Hungary, residing at Vienna, in the Empire of Austria- Hungary, have invented a certain new and useful Improvement in the Method of Metal Ornamentation, of which the following is a full, clear, and exact description.

The object of the present. invention is a method for producing brilliant black decorations, inscriptions, dsc., in rilievo on a dead silver ground, or vice versa.

In the accompanying drawings, Figure 1 is a plan view of a plate, showing siX dials and which are to be in three diEerentcolors-t`.`e., dials 1 and 2 black, 3 aud4 rcdyand .5 and 6 gold-colored. Fig.f2,shows thefplate coveredl by a pattern, withl the exception' .ofdals 3v and 4.- Fig. 3 shows the'fplate co'v'e'red by a pattern, with the exception, of `dials 5 and 6. Fig. 4 shows the copper and golddeposits covering the spaces left luncovered terns seen'.v in Figs, 2 and V3.

Heretofore it has not been possible to produce with the usual methods black or multicolored decorations or inscriptions on a dead silver ground. l

The object of the present invention is to produce not only brilliant decorations on a dead silvered ground, using the well-known chromatic-glue solution as a covering layer, but also the appearance of the ornamentation in rilievo on the silvered ground. Also brilliant decorations, consisting of brass, copper, and nickel in rilievo on a dead black or oxidated or a colored metal duced by my method. A

' My method is as follows: A clean metal plate, as 'of brass, is covered with a solution of c hromate glue. drying the solution by means of a suitable `centrifugal device the plate is exposed in the usual manger, developed, and heated over an intense gas-flame until the chrouiate-glue drawingappear'sofadark-brown'color. Then theplateis immersed a few minutes lin a solution consisting of one part of bichromate of potassium and one part sulfuric acid (66 Baum) aud water, so that the solution has a density4 of 14 Baume.

deposit removed with a sponge. To obtain by thevpa't-` ground, can be pro-` After distributing and` The plate is then Acleaned under a suitablesprinkler and the aud gives a finely-granulated deposit, correr,

sponding to the corroded parts, which latter are then electrosilvered in the usual manner. The copper-ing of the plate adapts the silverv plating to readily and uniformly adhere to the 'copper surface, thus producing better results. From the silvered metal plate, ou the ,surface of which the chromate-glue drawing appears on the dead silvered ground,or vice versa, the chromate-glue layer is removed in a warmed lye of carbonate of soda, so that at these places the blank metal color appears. The uncovered decoration is then corroded black, and the surface may be covered with a colorless lacquer.

. Metal objects treated as described show sharp metal blank and colored ornaments on a dead silvered or colored ground in rilievo.

If multicol'ored ornaments are to bepro-y duced ona dead silvered'or black ground, the metal object receives upon thefpoints where an otherwisecolored decoration is to beproduced by a galvanic bath under a pattern an electrodeposit of the desired color, and then the prepared plate is subjected to the process before described. Forinstance, on au index plate there are to be produced dials of three diiferent colors, so that (see Fig. l) dials l and 2 are black, dials 3 and 4 red, and dials 5 and 6 are gold color. For attaining the desired object the smooth yellow brass plate isV brought in a copper-bath under a pattern, as shown in Fig. 2, which covers the whole plate except dials 3 and 4, which receive a copper deposit, and then under the second pattern with openings for the dials and 6 in anelectrogoldl bath, so that dials 5 and 6 receive a gold deposit. The prepared plate is carefully washed and then covered witha layer of chromate glue,exposed undei-a negative,and developed,

the remaining covering layer burned, and then the plate is brought' in a metal-corrodin bath, Vwhich consists of bichromate of po- IOO tassium and sulfuric acid and water, in which bath the electrodeposits (gold and copper) are corroded, excepting the parts eoveredby the chromate glue, and also the line granulated ground is deadened, which metal ground is then coppered and silvered or blackened by the process before described. When the covering layer is removed in a diluted lye, the parts below the layer appear in the colors of the electrodeposits-1l e., the dials -1 and 2 appea'r in the natural yellow brass color, dials 3 and 4 appear coppered, and dials 5v and 6.

` to corrode slightly the objects before they are treated in the bath which gives the electrodeposits forming the ground color.

What I claim, and desire to secure by Letters Patent, is-

1. The herein-described steps iu the method ofy ornamenting metal, which consists in first covering the metal plate to be d,ecoratedwitl1 a solution of chromate glue and allowing the covering to dry, then exposing the covered plate under a negative, developing the draw- 2. The herein-described steps in the method l `ofornamenting metal, which consists in first applying an electrometal deposit to a metal vplate to be decorated, applying a solution of chromate glue to the plate, allowing the covering to dry, exposing the covered plate nn der a negative, developing the drawing, heating the plate to the extent described, subjecting said plate to the corroding action of a solution, such as described, washing the plate, applying an electrodeposit of a metal to the plate and electrosilvering the same and then removing the covering layer.

In testimony that I claim the foregoingas my invention I have signed my name in presence of two subscribing witnesses.

THEODO'R HAUSERMANN. Witnesses:

WILHELM BERGER, C. B. HURST. 

